US7751688B2 - Methods and apparatuses for reproducing subtitle streams from a recording medium - Google Patents

Methods and apparatuses for reproducing subtitle streams from a recording medium Download PDF

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Publication number
US7751688B2
US7751688B2 US10/911,731 US91173104A US7751688B2 US 7751688 B2 US7751688 B2 US 7751688B2 US 91173104 A US91173104 A US 91173104A US 7751688 B2 US7751688 B2 US 7751688B2
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style
text subtitle
user
selectable
text
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US20050163475A1 (en
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Kang Soo Seo
Byung Jin Kim
Jea Yong Yoo
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LG Electronics Inc
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LG Electronics Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/426—Internal components of the client ; Characteristics thereof
    • H04N21/42646—Internal components of the client ; Characteristics thereof for reading from or writing on a non-volatile solid state storage medium, e.g. DVD, CD-ROM
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N2/00—Magnetotherapy
    • A61N2/002—Magnetotherapy in combination with another treatment
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/14—Bandages or dressings; Absorbent pads specially adapted for the breast or abdomen
    • A61F13/148—Abdomen bandages or bandaging garments
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F5/00—Orthopaedic methods or devices for non-surgical treatment of bones or joints; Nursing devices; Anti-rape devices
    • A61F5/01—Orthopaedic devices, e.g. splints, casts or braces
    • A61F5/02—Orthopaedic corsets
    • A61F5/028—Braces for providing support to the lower back, e.g. lumbo sacral supports
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F5/00—Orthopaedic methods or devices for non-surgical treatment of bones or joints; Nursing devices; Anti-rape devices
    • A61F5/01—Orthopaedic devices, e.g. splints, casts or braces
    • A61F5/03—Corsets or bandages for abdomen, teat or breast support, with or without pads
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N2/00—Magnetotherapy
    • A61N2/004—Magnetotherapy specially adapted for a specific therapy
    • A61N2/006—Magnetotherapy specially adapted for a specific therapy for magnetic stimulation of nerve tissue
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61N2/00—Magnetotherapy
    • A61N2/004—Magnetotherapy specially adapted for a specific therapy
    • A61N2/008—Magnetotherapy specially adapted for a specific therapy for pain treatment or analgesia
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/432—Content retrieval operation from a local storage medium, e.g. hard-disk
    • H04N21/4325—Content retrieval operation from a local storage medium, e.g. hard-disk by playing back content from the storage medium
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/433—Content storage operation, e.g. storage operation in response to a pause request, caching operations
    • H04N21/4334—Recording operations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47—End-user applications
    • H04N21/488—Data services, e.g. news ticker
    • H04N21/4884—Data services, e.g. news ticker for displaying subtitles
    • H—ELECTRICITY
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    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/84—Television signal recording using optical recording
    • H04N5/85—Television signal recording using optical recording on discs or drums
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/82—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only
    • H04N9/8205—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only involving the multiplexing of an additional signal and the colour video signal
    • H04N9/8233—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only involving the multiplexing of an additional signal and the colour video signal the additional signal being a character code signal
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/06—Radiation therapy using light
    • A61N2005/0658—Radiation therapy using light characterised by the wavelength of light used
    • A61N2005/0659—Radiation therapy using light characterised by the wavelength of light used infrared
    • A61N2005/066—Radiation therapy using light characterised by the wavelength of light used infrared far infrared

Definitions

  • the present invention relates to a recording medium having at least one text subtitle stream for reproduction of images recorded thereon as well as methods and apparatuses for reproduction and recording.
  • Optical discs are widely used as an optical recording medium for recording mass data.
  • a new high density optical recording medium such as the Blu-ray Disc (hereafter referred to as “BD”)
  • BD Blu-ray Disc
  • the present invention is directed to a recording medium and methods and apparatuses for reproduction and recording that substantially obviate one or more problems due to limitations and disadvantages of the related art.
  • An object of the present invention is to provide a recording medium, enabling a user to select one of a plurality of user-selectable styles when displaying a subtitle on a display screen.
  • Another object of the present invention is to provide an apparatus and method of reproducing data streams recorded on a recording medium, enabling a user to select one of a plurality of user-selectable styles when displaying a subtitle on a display screen.
  • a further object of the present invention is to provide an apparatus and method of recording data streams on a recording medium, enabling a user to select one of a plurality of user-selectable styles when displaying a subtitle on a display screen.
  • a recording medium for reproduction of images includes a first data field storing at least one text subtitle stream.
  • the text subtitle stream includes text data for a text subtitle and a set of style information corresponding to a set of user-selectable styles, respectively.
  • Each style information includes a unique set of display properties required for displaying the text subtitle within a display screen.
  • the unique set of display properties includes at least one of a horizontal position, a vertical position, and a font size of the text subtitle within the display screen.
  • a method of recording data streams for reproduction of images on a recording medium includes the step of recording at least one text subtitle stream on the recording medium.
  • the text subtitle stream includes text data for a text subtitle and a set of style information corresponding to a set of user-selectable styles, respectively.
  • Each style information includes a unique set of display properties required for displaying the text subtitle within a display screen.
  • a method of reproducing data streams for reproduction of images recorded on a recording medium includes the step of reading at least one text subtitle stream from the recording medium.
  • the text subtitle stream includes text data for a text subtitle and a set of style information corresponding to a set of user-selectable styles, respectively.
  • Each style information includes a unique set of display properties required for displaying the text subtitle within a display screen.
  • an apparatus for recording data streams for reproduction of images on a recording medium includes a driver for driving an optical recording device to record data on the recording medium, and a microprocessor coupled to the driver.
  • the microprocessor controls operation of the driver to record at least one subtitle stream on the recording medium.
  • the text subtitle stream includes text data for a text subtitle and a set of style information corresponding to a set of user-selectable styles, respectively.
  • Each style information includes a unique set of display properties required for displaying the text subtitle within a display screen.
  • an apparatus for reproducing data streams of images recorded on a recording medium includes a driver for driving an optical reproducing device to reproduce data recorded on the recording medium, and a microprocessor coupled to driver.
  • the microprocessor controls operation of the driver to reproduce at least one text subtitle stream recorded in the recording medium.
  • the text subtitle stream includes text data for a text subtitle and a set of style information corresponding to a set of user-selectable styles, respectively.
  • Each style information includes a unique set of display properties required for displaying the text subtitle within a display screen.
  • FIG. 1 illustrates the structure of the files that manage data recorded in an optical disc according to the present invention
  • FIG. 2 illustrates data storage areas of an optical disc volume according to the present invention
  • FIG. 3A illustrates a table indicating subtitle display functions that are controllable by a user according to the present invention
  • FIG. 3B illustrates the fundamental concepts of changing the position and font size of a subtitle according to the present invention
  • FIGS. 4A to 4C illustrate various examples of changing the position and font size of a subtitle according to the present invention
  • FIG. 5 illustrates an example of changing the position and font size of a subtitle according to the present invention
  • FIG. 6 illustrates an example of changing the position and font size of a subtitle at the same time according to the present invention
  • FIG. 7 illustrates an apparatus of reproducing data streams recorded in an optical disc according to the present invention
  • FIG. 8A illustrates a user operation mask table stored in an optical disc according to the present invention
  • FIG. 8B illustrates the subtitle setting information stored in an optical disc according to the present invention.
  • FIG. 9 illustrates an apparatus for recording and reproducing text subtitle streams according to the present invention.
  • FIG. 1 illustrates data files for reproduction of images recorded in a Blue-ray (BD) disc according to the present invention.
  • BDMV Blue-ray
  • each BD directory includes an index file (index.bdmv) and an object file (MovieObject.bdmv), which represent general files that are used to interact with one or more users.
  • Each BD directory further includes three additional file directories that include information required for reproducing the data recorded in the disc.
  • the index file contains an index table which includes information regarding a plurality of selectable menus and titles.
  • the file directories included in each BD directory are a stream directory (STREAM), a play-list directory (PLAYLIST), and a clip information directory (CLIPINF).
  • the stream directory includes video and audio (AV) stream files having a particular format.
  • the AV stream files may be in the format of MPEG2 transport packets, which are often named as “*.m2ts” as shown in FIG. 1 .
  • the AV stream files included in STREAM are also called clip stream files in the BD industry standards.
  • the stream directory further includes at least one subtitle stream, which includes text data for a text subtitle and a set of style information corresponding to a set of user-selectable styles, respectively, may be multiplexed with the AV stream files within the stream directory, or it could exist as independent files within the same directory (STREAM). In the latter case, such independent files may be named as “*.tst”.
  • Each style information includes a unique set of display properties required for displaying the text subtitle within a display screen, and the unique set of display properties included in each style information includes at least one of a horizontal position, a vertical position, and a font size of the text subtitle within the display screen.
  • the text subtitle further includes style information corresponding to a default style. This default style information includes a default set of display properties required when initially displaying the text subtitle within the display screen by default. More details to these will be explained later with reference to FIG. 6 .
  • the clip information directory includes clip information files (e.g., 01000.clpi and 02000.clpi shown in FIG. 1 ) that correspond to the AV stream files, respectively.
  • Each clip information file includes property and timing information of a corresponding AV stream file, where the timing information includes information that maps Presentation Time Stamp (PTS) with Source Packet Number (SPN) using Entry Point Map.
  • PTS Presentation Time Stamp
  • SPN Source Packet Number
  • each pair of an AV stream file and its corresponding clip information file is often designated as “a clip”.
  • 01000.clpi included in CLIPINF includes property information and timing information of 01000.m2ts included in STREAM, and the pair of 01000.clpi and 01000.m2ts forms a clip.
  • the play-list directory includes one or more play-list files (*.mpls), where each play-list file includes at least one play-item which designates the time for play-back of a clip.
  • a play-item includes information designating beginning and ending times (In-Time and Out-Time) for play-back of a clip, which is designated by “Clip_Information_File_Name” within the play-item. Therefore, a play-list file represents basic information required for play-back of one or more clips designated by a combination of play-items.
  • the play-list file may further include one or more sub-play-items, which may or may not be synchronized with the play-items within the play-list file.
  • a subtitle represents caption information of images represented in a predetermined language. For example, when a user selects one of available subtitles while viewing images on a display screen, corresponding caption information is displayed on a predetermined portion of the display screen.
  • a subtitle is text information
  • the subtitle is called a text subtitle.
  • One of the essential features of the present invention is to allow one or more users to change display properties of a subtitle when playing-back AV streams prerecorded in a high-density optical disc. More details to such change in display properties of the subtitle will be described later in this section.
  • FIG. 2 illustrates data storage areas of an optical disc volume, in which the data files shown in FIG. 1 are prerecorded.
  • the disc volume includes a file system information area occupying the inmost portion of the disc volume, an AV stream area occupying the outmost portion of the disc volume, and a database area between the file system information area and the AV stream area.
  • file system information area system information that manages the entire data files is prerecorded.
  • audio-video data (AV streams) and at least one subtitle stream are prerecorded in the AV stream area.
  • the general files, play-list files, and clip-information files are prerecorded in the database area of the disc volume.
  • the general files include index and object files
  • the play-list files and clip-information files include information required for play-back of the AV streams prerecorded in the AV stream area.
  • a user is able to select a specific play-back mode and to play-back desired AV streams in the selected play-back mode using the information stored in the database area.
  • FIG. 3A illustrates a table indicating subtitle display properties (display functions) selected to be controlled by a user according to the present invention.
  • a list of subtitle display properties include fade-in or fade-out, change position, scrolling, font size, font color, font type (e.g., Gothic and etc.), font style (e.g., Bold and etc.), background color, text flow, text alignment, and line space functions.
  • all the subtitle display properties listed in FIG. 3A are changeable by an author (who records data in a disc), and they are then classified into user-changeable and user-unchangeable display properties.
  • the user-changeable subtitle display properties are limited to at least one of a position and a font size of a subtitle.
  • the position and font size of a subtitle significantly affect the user's view of the images on a display screen. Therefore, it would be very convenient for any user to be able to change the position and the font size of the subtitle. Any change of other subtitle display properties such as scrolling and font color parameters may rather seriously impair the display quality of the whole images being displayed.
  • the user's control of the position and font size of the subtitle may be limited during a specified play-back time by limiting the user operation (UO).
  • UO user operation
  • One of the main reasons for limiting the user's control is that the position and font size of the subtitles may not be properly changed when playing-back a certain type of AV streams.
  • the information allowing or limiting the user's control of the position and font size of the subtitles is included in the disc, and more details to this will be described later with reference to FIG. 8A .
  • changes of the position and font size of the subtitle must be within the permitted ranges.
  • the position and font size of the subtitles must be limited such that the displayed subtitle must be within a predefined area within a display screen.
  • the font size must be chosen such that the entire texts are included within a subtitle area of the screen.
  • the permitted ranges of the position and font size of the subtitles can be predefined by the author and be stored in the disc, or they can be manually set and be changed by a user.
  • FIG. 3B illustrates the fundamental concepts of changing the position and font size of the subtitles according to the present invention.
  • the first example illustrated in FIG. 3B shows the change of the position of the subtitle only, but both of the position and font size are changed in the second example.
  • it is not illustrated in FIG. 3B it is also possible to change the font size of the subtitle without changing the subtitle position.
  • the changes of the position and/or font size of the subtitle must be limited such that the changes are within permitted ranges.
  • FIGS. 4A to 4C illustrate various examples of changing the position of a subtitle according to the present invention.
  • the predefined positions of a subtitle are bottom position (position No. 1), center position (position No. 2), and top position (position No. 3) within a display screen.
  • the position of the subtitle may be changed between the predefined positions when a request is made by a user.
  • the predefined positions of a subtitle are right position (position No. 4) and left position (position No. 5).
  • the position of the subtitle shown in FIG. 4B may be changed between the predefined positions each time a request is made by a user.
  • information indicating a set of predefined positions of a subtitle such as those shown in FIGS. 4A and 4B may be prestored within a disc.
  • the subtitle which is initially positioned at an initial position (default position) is moved between the predefined positions in a predefined order.
  • the initial position may or may not be any one of the predefined positions.
  • a subtitle may move in the order of the bottom position (position No. 1), center position (position No. 2), top position (position No. 3), right position (position No.
  • the subtitle may also move in the order of the bottom position (position No. 1), top position (position No. 3), right position (position No. 4), left position (position No. 5), and center position (position No. 2).
  • the number of the predefined positions described above may be predefined by defining the maximum number of the predefined positions, which will be described in more detail later with reference to FIG. 8B .
  • a desired position of a subtitle may be manually selected by a user by using a user interface unit, examples of which are a mouse, a remote control, and a control panel provided at a display device.
  • a user interface unit examples of which are a mouse, a remote control, and a control panel provided at a display device.
  • the user may manually select his or her desired subtitle position by using a cursor which may be controlled by the user interface unit.
  • the user may input coordinate information of a desired subtitle position by pressing the button keys included in the user interface unit.
  • FIG. 4C illustrates another example of changing the position of a subtitle according to the present invention, where the subtitle is for images displayed in a window (e.g., a picture-in-picture window), which occupies only a portion of the display screen.
  • the subtitle is displayed at a position outside of the window (e.g., position No. 6 shown in FIG. 4C ) but within an effective area of the display screen.
  • the specific methods of changing the subtitle position described above with reference to FIG. 4A and FIG. 4B are also applicable in this case.
  • FIG. 5 illustrates an example of changing the position and font size of a subtitle at the same time according to the present invention.
  • information indicating a set of predefined font sizes (font_size No. 1, font_size No. 2, and font_size No. 3) and a set of predefined positions (position No. 1, position No. 2, and position No. 3), such as those shown in FIG. 5 may be prestored in a disc.
  • a request for changing display setting of the subtitle e.g., selection of a menu operation
  • the font size of a subtitle which is initially displayed at a default font size, is changed between the predefined font sizes in a predefined order.
  • the subtitle which is initially positioned at a default position, is also moved between the predefined positions in a predefined order.
  • the font size of the subtitle may change in the order of font_size No. 1, font_size No. 2, and font_size No. 3, and the position may change in the order of position No. 1, position No. 2, and position No. 3, as shown in FIG. 5 .
  • a desired font size and position of a subtitle may be manually selected by a user using a user interface unit (e.g., a remote control and a control panel provided at a display device). For example, the user may manually enter a desired font size and position by using the user interface unit.
  • the number of the predefined positions and font sizes may be predefined by the user by defining the maximum number of positions and the maximum number of font sizes, which will be described in more detail later with reference to FIG. 8B .
  • FIG. 6 illustrates an example of changing the style of a subtitle according to the present invention.
  • a set of a position and a font size of a text subtitle are defined as a style, and a subtitle is initially displayed at a default style (e.g., style No. 1 shown in FIG. 6 ) when the subtitle streams recorded in a disc are preloaded by a disc player.
  • the default style represents a set of a default position and font size previously determined by an author of the disc, and the information indicating the default style is recorded in the disc.
  • style information indicating a set of predefined user-selectable styles are stored in an optical disc.
  • the position and font size of the subtitle automatically change to particular position and font size that correspond to the selected style.
  • the position and font size of a subtitle is changed between the set of predefined styles in a predefined order.
  • the position and font size of a subtitle may change in the order of style No. 2, style No. 3, style No. 4, . . . , and style No. N, as shown in FIG. 6 .
  • a desired style representing a desired position and font size may be manually defined by a user using a user interface unit as described above in detail.
  • the number of user-selectable styles may be limited by defining the maximum number of the styles, which will be described in detail later in this section with reference to FIG. 8B .
  • FIG. 7 illustrates an apparatus of reproducing data streams for reproduction of images recorded in an optical disc according to the present invention.
  • AV streams and at least one subtitle text stream are read from the optical disc.
  • the subtitle stream includes text data for a text subtitle, and display information indicating various display property values set by default for initially displaying the subtitle within a display screen. These display property values set by default include menu language, audio language, subtitle language, subtitle position, subtitle font size, and style.
  • the memory 15 initially stores the style identification of the default style and all other display properties in corresponding registers.
  • the subtitle stream further includes a set of style information corresponding to a set of user-selectable styles.
  • the memory 15 stores the style identification of the selected style is stored in a corresponding register.
  • the default subtitle position, font size, and style values preloaded from the optical disc are position No. 1, font size No. 1, and style No. 1, and these values are stored in their corresponding registers within the memory 15 .
  • the memory 15 also includes registers for storing user-updated display information when a request for changing the subtitle setting is received.
  • the user-updated subtitle position, font size, and style values are position No. 3, font size No. 2, and style No. 5, and these values are stored in corresponding registers within the memory 15 .
  • the updated subtitle setting information are used in the font engine 18 and the AV decoder 17 when playing-back the preloaded subtitle data on a display screen, and these operations are controlled by a controller 12 .
  • the memory 15 may be any one of various storages including a RAM and a buffer, all of which could be easily equipped within the disc player.
  • FIG. 8A illustrates a user operation mask table stored in an optical disc according to the present invention.
  • the information included in the table indicates whether to allow a user to change the subtitle setting.
  • the user operation mask table (UO_mask_Table) shown in FIG. 8A may be included in any one of AppInfoPlayList ( ), PlayItem ( ), ICS ( ), TextSubtitleInfo ( ) of the play-list files, respectively.
  • the user operation mask table includes subtitle_position_change_mask field indicating whether to allow changes of the subtitle position, subtitle_font_size_change_mask field indicating whether to allow changes of the subtitle font size, and Subtitle_style_change_mask indicating whether to allow changes of the subtitle style.
  • FIG. 8B illustrates the subtitle setting information stored in a clip information file (*.clpi) according to the present invention.
  • a clip information file includes property and timing information of a corresponding AV stream file, and it includes information such as ClipInfo ( ), Sequence Info ( ), ProgramInfo ( ), CPI ( ), ClipMark ( ), and etc.
  • StreamCodingInfo ( ) included in ProgramInfo ( ) contains information indicating the coding type of the corresponding AV stream.
  • StreamCodingInfo ( ) also includes the subtitle setting information, examples of which are the maximum number of available subtitle positions (Maximum_number_of_positions), the maximum number of available subtitle font sizes (Maximum_number_of_font_sizes), and the maximum number of the user-selectable subtitle styles (Maximum_number_of_styles), all of which may be set by an author.
  • the maximum number of the user-selectable styles may be less than or equal to 25 due to the limited data storage space in an optical disc. Therefore, when a user makes a request for changing the subtitle setting into values that are not supported by these limitations, a warning message indicative of “out of supported range” could be provided or the setting could be set to values close to the supported values.
  • FIG. 9 illustrates an optical disc player according to the present invention.
  • the disc player shown in FIG. 9 includes a pickup unit 11 that reads AV stream data and subtitle setting data prerecorded in an optical disc, a servo 14 which controls operation of the pickup unit 11 , a signal processor 13 which restores a signal received from the pickup unit 11 or modulates a signal into a recordable signal, a memory 15 which stores control information including the subtitle setting data, and a microprocessor 16 which control operations of the servo 14 , the signal processor 13 , and the memory 15 .
  • the optical disc player further includes an AV decoder 17 that decodes the AV signal received from the signal processor 13 , and an AV encoder 18 which converts an input AV signal into a certain signal, such as MPEG2 transport streams, and transmits the converted signal to the signal processor 13 .
  • the disc player further includes a controller 12 , which basically controls operations of each unit included in the disc player. When a request for a change in the subtitle setting is made, the controller 12 determines whether the requested change is within the permitted setting ranges. For example, it determines whether a requested change in the position or font size of a subtitle is within the permitted ranges, or it determines whether such change is within an effective area of the display screen.
  • the controller 12 changes the setting of a subtitle based on these determinations.
  • the controller 12 also uses the user operation mask table (UO_mask_Table) information when determining whether a change in the subtitle setting for a particular play-back time is permitted or prohibited.
  • UO_mask_Table user operation mask table

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